Q6 / 120 · VITEEE 2018 · Chemistry

The reagent (s) which can be used to distinguish acetophenone from benzophenone is (are)

  • A
    2,4-dinitrophenylhydrazine
  • B
    aqueous solution of $\mathrm{NaHSO}_{3}$
  • C
    benedict reagent
  • Correct answer
    D
    $\mathrm{I}_{2}$ and $\mathrm{Na}_{2} \mathrm{CO}_{3}$.

Solution

$\mathrm{I}_{2}$ and $\mathrm{Na}_{2} \mathrm{CO}_{3}$ react with acetophenone $\left(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCH}_{3}\right)$ to give yellow ppt. of $\mathrm{CHI}_{3}$ but benzophenone $\left(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COC}_{6} \mathrm{H}_{5}\right)$ does not and hence can be used to distinguish between them.

Hence, the correct answer is option: 'D'.

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